A senior official of Yemen's ruling Ansarullah says Saudi Arabia would be responsible for an escalation in attacks on his country.

Mohammed Abdulsalam's comments on Monday came after Saudi Arabia carried out extensive attacks on several provinces of Yemen, killing tens of people in civilian areas.

"Saudi Arabia must accept full responsibility for these attacks," Abdulsalam, an Ansarullah spokesman, said, warning that Riyadh would suffer massive consequences because of the new escalation.

He said the Saudi decision to intensify attacks on Yemen is rooted in its military defeats in the past and its failure to mobilize regional countries against Yemen.

Saudi attacks on Monday targeted residential areas in the provinces of Sana'a in the north, where the capital is located, as well as the provinces of Sa'adah, Hajjah, and Ta'iz, in the north, northwest, and southwest of Yemen.

A spokesman for the so-called Saudi-led coalition against Yemen said that some 100 fighter jets were contributing to the new operation against the impoverished country, which also involved ground troops affiliated with a deposed Saudi-linked Yemeni government.

The escalation is the most serious since Saudi Arabia bombed the main airport in the Yemeni capital, Sana'a, in July, prompting Yemeni armed forces to launch missile and drone attacks on the kingdom.

The Yemeni forces have vowed to continue attacks on Saudi military and energy sites until Riyadh breaks a 10-year siege on Yemen that has crippled its economy.

Saudi attacks on Yemen are also aimed at weakening the Yemeni military's control over Bab el-Mandeb, a waterway in the Red Sea which is key to Riyadh's oil exports.

Yemeni forces advanced to areas near and inside the strait in mid-September after defeating foreign-backed forces based in those regions.